>>> from contaminacio import calcula_co2

>>> litres_petroli = 158.987*(1/74)
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
2.3

>>> litres_petroli = 158.987
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
170.2

>>> litres_petroli = 158.987*2
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
340.4

>>> litres_petroli = 158.987/2
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
85.1

>>> litres_petroli = 158.987/3
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
56.733

>>> litres_petroli = 158.987*3
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
510.6

>>> litres_petroli = 0
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
0.0

>>> litres_petroli = 1
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
1.071

>>> litres_petroli = 158.987*(1/74)
>>> quantitat_co2 = calcula_co2(litres_petroli)
>>> round(quantitat_co2, 3)
2.3